水玻璃-碱渣-矿渣固化高含水率淤泥的强度性质  

STRENGTH PROPERTIES OF DREDGED SILT AT HIGH WATER CONTENT TREATED WITH SODIUM SILICATE, SODA RESIDUE AND GROUND GRANULATED BLASTFURNACE SLAG

作　　者：何俊 石小康 栗志翔 HE Jun;SHI Xiaokang;LI Zhixiang(School of Civil Engineering,Architectural and Environment,Hubei University of Technology,Wuhan 430068)

机构地区：[1]湖北工业大学土木建筑与环境学院

出　　处：《工程地质学报》2019年第4期729-736,共8页Journal of Engineering Geology

基　　金：国家自然科学基金面上基金项目(41772332);湖北省技术创新专项重大项目(2017ACA090)资助~~

摘　　要：利用工业固体废弃物碱渣和矿渣作为固化剂,水玻璃作为激发剂,对高含水率疏浚淤泥的强度性质进行试验研究,并通过X射线衍射测试探讨固化机理。研究表明,在对含水率为110%疏浚淤泥固化的正交试验中,碱渣、矿渣和水玻璃掺量越多固化土的无侧限抗压强度越大,影响3d强度的因素主次关系为碱渣>水玻璃>矿渣,而7d和28d时变为水玻璃>碱渣>矿渣,水玻璃对28d强度的影响显著。当水玻璃掺量一定而碱渣与矿渣总掺量相同时,碱渣对固化淤泥的作用强于矿渣。固化土中的水化产物包括钙矾石、水化氯铝酸钙、水钙沸石和水化硅酸钙等,其填充和胶结作用使淤泥强度得到提高。研究确定了满足一般填土工程要求的固化方案,为碱渣和矿渣作为高含水率淤泥固化剂的资源化利用提供理论依据和参数支持。Two industry by-products,soda residue(SR)and ground granulated blastfurnace slag(GGBS),and sodium silicate(SS)were utilized to stabilize dredged silt at high water content.The unconfined compressive tests and X-ray diffraction were conducted to analyze the strength characteristics and the mechanism.The results indicate that the increase in dosage of SS,SR and GGBS can increase the unconfined compressive strength for the samples with the initial water content of 110%.The order of factors for strength of 3 days curing is SS>SR>GGBS.The order changes to SS>SR>GGBS for samples cured for 7 and 28 days.SS has a significant impact on the strength of 28 days curing.When the dosage of SS is fixed and the total dosage of SR and GGBS is the same,the effect of SR is stronger than that of GGBS.The hydration reaction among SS,SR,GGBS and soil minerals produces hydration products including ettringite,calcium chloro-aluminate hydrates,gismondine,and calcium silicate hydrates.They play the filling-in and cementation effects.The solidification scheme to meet the requirement of fill construction was determined.The results can provide a theoretical basis and data support for the resource utilization of SR and GGBS as stabilizer for dredged silt at high water content.

关 键 词：高含水率 疏浚淤泥 固化 无侧限抗压强度 碱渣 

分 类 号：TU443[建筑科学—岩土工程]